File talk:Action potential.svg

Refractory period
The "refractory period" label on the current graph is misleading; it seems to suggest that the refractory period is due to the hyperpolarizing overshoot (perhaps through K-channel shunting?). In the case of the standard neural action potential, refractory period is the result of Na-channel inactivation, so doesn't have much to do with the overshoot.

Would be better to label the overshoot appropriately as "hyperpolarizing overshoot" and label the stretch beginning with the overshoot and continuing to the end of the graph the "refractory period".